I met Bárbara while swimming on an intramural team at the University of Chile in Santiago.  She specializes in swimming in freezing water (32-48 degrees Fahrenheit) and let me tag along to document one of her practice swims at Laguna del Inca behind Ski Portillo, a ski center at 2880m (9450ft) in altitude.  She is training to swim at the World Championship in ice swimming in Russia next year!